/*
 * $Id: Encoder.java,v 1.2 2006/07/17 20:22:40 larry Exp $ 
 */
package com.representqueens.spark;

/*
 * 
 * Copyright 2006 Larry Ogrodnek
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import javax.imageio.ImageIO;

/**
 * Encodes Image data as Strings, using code from David Flanagan's website
 * (http://www.davidflanagan.com/).
 * 
 * @author David Flanagan
 * @author Larry Ogrodnek <larry@cheesesteak.net>
 * @version $Revision: 1.2 $ $Date: 2006/07/17 20:22:40 $
 */
public class Encoder {
    public enum Format {
	DATA, JAVASCRIPT
    };

    public static String encode(final BufferedImage bi, final Format format)
	    throws IOException {
	try {
	    final ByteArrayOutputStream os = new ByteArrayOutputStream();

	    ImageIO.write(bi, "png", os);

	    final byte[] data = os.toByteArray();

	    final String rawString = new String(data, "iso8859-1");

	    String encoded = URLEncoder.encode(rawString, "iso8859-1");
	    encoded = encoded.replaceAll("\\+", "%20");

	    if (Format.JAVASCRIPT.equals(format)) {
		return "javascript:'" + encoded.replaceAll("%", "\\\\x") + "'";
	    }

	    return "data:image/png," + encoded;
	} catch (final UnsupportedEncodingException uee) {
	    throw new RuntimeException(uee);
	}
    }
}
